Persicaria affinis (knot weed)
Detail of an illustration of Persicaria affinis
Persicaria affinis (D.Don) Ronse Decr.
knot weed, Himalayan fleece flower
Not evaluated according to IUCN Red List criteria.
Rocky mountainsides, screes, glacial moraines, alpine pastures, wet meadows and river banks.
Ornamental, traditional medicine.
Apparently distasteful to grazing animals.
About this species
This perennial forms mats that creep over rocks and steep slopes in the central Himalaya. The fresh green leaves emerge in spring and the flower spikes develop in late summer, bearing numerous, small pink or red flowers. After the first frosts, the leaves turn red then chestnut-brown.
One of Kew’s early directors, Sir Joseph Hooker, admired this species in the Himalaya, and described it ‘hanging in rosy clumps from moist precipices’.
Polygonum affine D.Don, Bistorta affinis (D.Don) Greene, Polygonum brunonis Wall.